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dnl SPARC v9 mpn_cnd_add_n and mpn_cnd_sub_n for T3/T4/T5.
dnl Contributed to the GNU project by David Miller and Torbjörn Granlund.
dnl Copyright 2013, 2017 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
C cycles/limb
C UltraSPARC T3: 8.5
C UltraSPARC T4: 3
C We use a double-pointer trick to allow indexed addressing. Its setup
C cost might be a problem in these functions, since we don't expect huge n
C arguments.
C
C For sub we need ~(a & mask) = (~a | ~mask) but by complementing mask we can
C instead do ~(a & ~mask) = (~a | mask), allowing us to use the orn insn.
C INPUT PARAMETERS
define(`cnd', `%i0')
define(`rp', `%i1')
define(`up', `%i2')
define(`vp', `%i3')
define(`n', `%i4')
define(`mask', `cnd')
define(`up0', `%l0') define(`up1', `%l1')
define(`vp0', `%l2') define(`vp1', `%l3')
define(`rp0', `%g4') define(`rp1', `%g5')
define(`u0', `%l4') define(`u1', `%l5')
define(`v0', `%l6') define(`v1', `%l7')
define(`x0', `%g1') define(`x1', `%g3')
define(`w0', `%g1') define(`w1', `%g3')
ifdef(`OPERATION_cnd_add_n',`
define(`LOGOP', `and $1, $2, $3')
define(`MAKEMASK',`cmp %g0, $1
addxc( %g0, %g0, $2)
neg $2, $2')
define(`INITCY', `addcc %g0, 0, %g0')
define(`RETVAL', `addxc( %g0, %g0, %i0)')
define(`func', `mpn_cnd_add_n')
')
ifdef(`OPERATION_cnd_sub_n',`
define(`LOGOP', `orn $2, $1, $3')
define(`MAKEMASK',`cmp $1, 1
addxc( %g0, %g0, $2)
neg $2, $2')
define(`INITCY', `subcc %g0, 1, %g0')
define(`RETVAL', `addxc( %g0, %g0, %i0)
xor %i0, 1, %i0')
define(`func', `mpn_cnd_sub_n')
')
MULFUNC_PROLOGUE(mpn_cnd_add_n mpn_cnd_sub_n)
ASM_START()
REGISTER(%g2,#scratch)
REGISTER(%g3,#scratch)
PROLOGUE(func)
save %sp, -176, %sp
MAKEMASK(cnd,mask)
andcc n, 1, %g0
sllx n, 3, n
add n, -16, n
add vp, n, vp0
add up, n, up0
add rp, n, rp0
neg n, n
be L(evn)
INITCY
L(odd): ldx [vp0 + n], v1
ldx [up0 + n], u1
LOGOP( v1, mask, x1)
addxccc(u1, x1, w1)
stx w1, [rp0 + n]
add n, 8, n
brgz n, L(rtn)
nop
L(evn): add vp0, 8, vp1
add up0, 8, up1
add rp0, -24, rp1
ldx [vp0 + n], v0
ldx [vp1 + n], v1
ldx [up0 + n], u0
ldx [up1 + n], u1
add n, 16, n
brgz n, L(end)
add rp0, -16, rp0
L(top): LOGOP( v0, mask, x0)
ldx [vp0 + n], v0
LOGOP( v1, mask, x1)
ldx [vp1 + n], v1
addxccc(u0, x0, w0)
ldx [up0 + n], u0
addxccc(u1, x1, w1)
ldx [up1 + n], u1
stx w0, [rp0 + n]
add n, 16, n
brlez n, L(top)
stx w1, [rp1 + n]
L(end): LOGOP( v0, mask, x0)
LOGOP( v1, mask, x1)
addxccc(u0, x0, w0)
addxccc(u1, x1, w1)
stx w0, [rp0 + n]
stx w1, [rp1 + 32]
L(rtn): RETVAL
ret
restore
EPILOGUE()
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